I doubt a fuel filter would cause it. If the fuel filter is clogged, it would starve for fuel under heavy acceleration not under light acceleration. If you disconnect the vacuum hose to the fuel pressure regulator, the fuel pressure should rise. If it doesn't, the regulator went bad.
You disconnected the maf but did you clean it. The maf measures airflow across it's surface. They make a special cleaner for it.
If you disconnect it the engine is blind to a sudden increase in airflow so I don't know how that proves there is nothing wrong with the maf. I would try cleaning it with the special cleaner. I think I've heard these cars maf's have a tendency to go bad.
I still have both my originals but that is something I've heard.
I had a bad spark knock sensor on a later model car and it did cause a bit of a bog on light acceleration from say 30-35 Mph.
You can disconnect that one and see if it helps but do not stomp your foot down too far and go into boost or you could hurt the engine.
It could be the TPS but you have not supplied much background info on this car like mileage mods etc.
But if you get your scan master, that should help determine if that is the problem.
I doubt the oxygen sensor is at fault, it only fine tunes the air fuel ratio when the engine is cruising or idling etc. It does not richen the mixture
as you open the throttle. It is also not sending info when the engine is cold.